Electrical timer with improved gear-cam structure

ABSTRACT

A timing means, a substantially-thin second timing means, and a motor are combined in such a manner that one is sandwiched in between the other two.

a A 7 United States Paten [191 [1 1 3,824,357 Brown et al. I July 16, 1974 ELECTRICAL TIMER WITH IMPROVED [56] References Cited GEAR-CAM STRUCTURE UNITED STATES PATENTS Inventors: William Brown; Noel Mullikin, 3,319,198 5/1967 Thomas 200/27 R x both of Beech Grove, Ind. 3,610,848 l0/l97l Rosenberg 200/38 B 3,699,278 10/1972 Jones et al. 200/38 B x [73] Ass'gnee- R MaloTy & 3,727,015 4/1973 Yoland et al. 200 38 R Indianapolis, Ind.

[22] Filed: Apr. 16, 1973 Primary Examiner-James R. Scott [21] APP] 351 347 Attorney, Agent, or FirmCharies W. Hoffmann; Rob- I I ert F. Meyer [52] U.S. Cl. 200/38 B, 200/153 LB, 200/168 R 51 110.01. HOlh 7/08, HOlh 43/10 [57] ABSTRACT Field of Search-m 2 27 30 30 A timing means, a substantially-thin second timing 200/31 R, 31 A, 38 R, 38 B, 38 BA, 38 C, 38 CA, 153 L, 153 LA, 153 LB, 166 J, 168 R, 168 K means, and a motor are combined in such a manner that one is sandwiched in between the other two.

29 Claims, 7 Drawing Figures 1 ELECTRICAL TIMER WITH IMPROVED GEAR-CAM STRUCTURE Generally speaking, the present invention relates to a combination comprising a synchronous motor; a first timing means including a first switching means responsive to a first cam means and an enclosure enveloping A typical application of this combination is in a domestic automatic clothers dryer. In this embodiment, the primary timing means is a dryer timer. The substantially-thin second timing means is attached to a dryer timer and a motor. The resulting package comprises two timers driven by the same motor, in a space slightly larger than the space normally occupied by a motor and dryer timer alone. The second timing means may be added to accomplish an additional timed switching feature not available or atainable in the primary timer alone. In the example of the clothes dryer, the second timing means may be added to produce short pulses of switching to periodically start and stop the dryer drum rotation after the normal drying cycle. The purpose of this example of switching is to keep permanent press clothes intermittently moving around during the cooldown time to discourage wrinkle formation. 1

One embodiment of the second timing means utilizes two cam members disposed side-by-side instead of the conventional in-line arrangement of cams. This sideby-side embodiment is thinner in a dimension taken parallel to the cam axes than an in-line version employing the same number of cam members. In many appliances in which this combination might be used, the depth of the space alloted for a timer switch is limited, and therefore, the thin size of the second timing means is very desirable.

Accordingly a feature of the presentinvention is to provide a combination of a substantially-thin timing means, another timing means, and a motor, one of which is sandwiched between the other two. Another feature of the present invention is to provide a substantially-thin timing means, including one cam member in combination with a motor and another timing means, one of which is sandwiched between the other two. Another feature of the present invention is to provide a substantially-thin timing means, including two cam members operating side-by-side on parallel shafts, in combination with a motor and another timing means,- one of which is sandwiched in between the other two. Still another feature of the present invention is to provide a substantially-thin timing means substantially enveloped by an enclosure that provides support, location, and entrapment of switch members. Yet another feature of the present invention is to provide a substantially-thin timing means wherein electrical switching members are located in one of a plurality of alternate locations in an enclosure and are responsive to at least one of two cam members. Another feature of the invention is to provide a thin timing means including a contact-spacing means separating two of a plurality of contact-carrying blades a predetermined distance apart to achieve improved switching characteristics; Another feature of the present invention is to provide a thin timing means that is neat and compact in size. Another feature of the present invention is to provide a thin timing means that is simple and economical to produce.

These and other features of the invention will become apparent from the following description taken in conjunction with the accompanying drawing wherein:

FIG. 1 is an elevation view of an embodiment of the invention.

FIG. 2 is a front view of an embodiment of the second timing means utilizing a primary cam and a set of contacting carrying blades.

FIG. 3 is a front view of the same embodiment as shown in FIG. 2 with the cam flipped over and the contact-carrying blades in an alternate location.

FIG. 4 is a front view of an embodiment of the second timing means utilizing two cams and two sets of contacting-carrying blades.

FIG. 5 is a front view of the same embodiment shown in FIG. 4 with the cams flipped over and the sets of contact-carrying blades interchanged.

FIG. 6 is a rear view of a slider engaging a set of contact-carrying blades.

FIG. 7 is a view showing the cooperation of the cams with its contact carrying blades.

Referring now to the drawing, a motor 10, a first timing means 12 and a substantially-thin second timing means 20 are connected together by an attachment means 11. In the embodiment shown in FIG. 1, substantially-thin second timing means 20 is sandwiched in between motor 10 and first timing means 12. Attachment means 11 comprises a motor attachment means 13 and a timer attachment means 15. Motor attachment means 13 comprises a plurality of hollow rivets 16 inserted through holes in the motor 10 and substantially-thin second timing means 20 are headed over, thereby securing the two together. Timer attachment means 15 comprises screws 14 piloted through the rivets 16 and threaded into a first enclosure 18 of first timing means 12, thereby securing first timing means 12 to motor 10 and second timing means 20.

First timing means 12 includes a first cam means 22, a first electrical switchingmeans 24 and first enclosure 18. Substantially-thin second timing means includes a second cam means 26, a second switching means 28 and'a second enclosure 30. t

In the embodiment shown in FIGS. 2 and 3, second cam means 26 includes a primary cam member 32 comprising two cam tracks 34 and 36. Primary cam member 32 is carried on an output shaft 38 extending from motor 10. A pinion 35, also carried on output shaft 38, engages a drive gear 37 on a cam carrying shaft 39 in first timing means 12. First cam means 22 is carried on cam shaft 39.

In the embodiment shown in FIGS. 4, 5 and 7, second cam means 27 includes a primary cam member 40 comprising two cam tracks 42 and 44 and a cam separation means 46. Cam separation means 46 comprises a gear 48 sandwiched in between the two cam tracks 42 and 44. Second cam means 27 further includes a secondary cam member 50 comprising two cam tracks 52 and 54 and a cam separation means 56. Secondary cam member 50 is carried on a second shaft 49 which is rotatably journaled in cup-shaped housing 58. Cam separation means 56 comprises a gear 57 sandwiched in beshaft 38, and the perimeter is measured around the second enclosure in a plane substantially perpendicular to the longitudinal axis of the output shaft 38. The cupshaped housing 58 includes a first set of substantially narrow slots 62 disposed in a wall 59 of the cup-shaped housing as shown in FIG. 2. A second set of substanv tially narrow slots 64 is shown disposed in an alternate location in wall 59 in FIG. 3. Each set of slots 62 and 64 contains a plurality of slots, and the sets are located one on either side of a line through the centers of primary cam member 40 and secondary cam member 50.

Second electrical switching means 29 includes a long set 70 and a short set 72 of contact-carrying blades, each set being inserted in one of the sets of slots 62 and 64 in the embodiment shown in FIGS. 4 and 5. The

In the embodiment of the invention shown in FIGS. 2 and 3, second cam means 26 comprises a primary cam member 32. As primary cam member 32 rotates past cam follower tips 69 and 67 respectively, contacts 63 make and break according to profiles on cam tracks 34 and 36. I

In the embodiment of the invention shown in FIGS. 4 and 5, second cam means 27 comprises primary cam member 40 and secondary cam member 50. As primary cam member 40 rotates past cam follower tips 74 and 76, the long set of contact-carrying blades 70 respond to the profiles of cam tracks 42 and 44 causing electrical contacts 71 to open and close.

Gear 48 drives gear 57 on secondary cam member 50. This causes cam tracks 52 and 54 to rotate past the cam follower tips 78 and 80. The short set of contactcarrying blades 72 respond to the profiles of cam tracks 52 and 54 causing electrical contacts 73 to open and close.

Lugs 88 and 90 on slide 84 engage two of the long set of contact-carrying blades 70 to partially space 7 contacts 71' apart during their opening and closing.

Lugs 94 and 96 on slider 92 engage two of the short set of contact-carrying blades 72 to partially space contacts 73 apart during their opening and closing.

What is claimed is:

1. In combination, a motor, a first timing means, and a substantially-thin second timing means, one of said motor, first timing means and substantially thin second timing means sandwiched in between the other two,

' and an attachment meanswherein:

long set 70 is responsive to primary cam member 40,

and the short set 72 is responsive to secondary cam member 50. Cam follower tips 74 and 76 are disposed on the distal ends of two of the long set of contactcarrying blades 70, and cam follower tips 78 and 80 are disposed on the distal ends of two of the short set of contactcarrying blades 72. A first set of contacts 71 is carried by the long set of contact-carrying blades 70, and a second set of contacts 73 is carried by the short set of contact-carrying blades 72. Cover 60 of second enclosure 30 entraps the long set and short set of contact-carrying blades 70 and 72 in the sets of slots 62 and 64.

In the embodiment shown in FIGS. 4 and 5, the set of slots 62 is located on one side of a line A-B through the centers of primary cam member 40 and secondary cam member 50, and set of slots 64 is located on the other side of line A-B.

A contact spacing means 82 comprises a slider 84 freely translatable'along one of a plurality of slider guides 86 which are disposed on the inside of cupshaped housing 58. Slider 84 includes lugs 88 and 90 which engage the long set of contact-carrying blades 70. Slider 92 includes lugs 94 and 96 which engage the short set of contact-carrying blades 72. The long and short sets of contact-carrying blades 70 and 72 restrain sliders 84 and 92 each in contact with a slider guide 86.

In operation, motor 10 causes output shaft 38 to rotate. Pinion 35 turns drive gear 37, and first cam means 22, carried on cam-carrying shaft 39, is therefore rotated. Also rotated by output shaft 38 is second cam I means 26 and 27.

a. said motor includes an output shaft extending into said substantially-thin second timing means and said first timing means;

b. said first timing means comprises a first cam means, a first electrical switching means responsive to said first cam means, a first enclosure substantially enveloping both of said first cam means and said first electrical switching means;

0. said substantially-thin second timing means comprises a second cam means, a second switching means responsive to said second cam means, and a second enclosure substantially enveloping both of said second cam means and said second'electrical switching means;

d. said attachment means includes a motor attachment means coupling said motor to one of said first and second enclosures and a timer attachment means for coupling said first enclosure to said sec ond enclosure; and

e. said enclosure includesv a ratio of thickness-toperimeter distance of from l/40 to l/20, wherein said thickness is taken in a direction substantially parallel to a longitudinal axis of said output shaft, and said perimeter is measured around said second enclosure in a planesubstantially perpendicular to said longitudinal axis of said output shaft.

2. The combination according to claim 1 wherein said substantially-thin second timing means is sandwiched in between said motor and said first timing means. 7

3. The combination according to claim 2 wherein said motor attachment means comprises a plurality of hollow rivets inserted through a plurality of holes in said second enclosure and through a matching plurality curing said second enclosure to said motor.

4. The combination according to claim 3 wherein said timer attachment means comprises a plurality of screws each with a head and shank, the shanks of which are inserted through said hollow headed-over rivets and threaded into said first enclosure, thereby securing said first timing means to said motor and said substantially thin second timing means. 1

5. The combination according to claim 1 wherein said second cam means in said substantially-thin second timing means comprises one primary cam member.

6. The combination according to claim 5 wherein said primary cam member includes two substantially concentric primary cam tracks.

7. The combination according to claim 6 wherein said primary cam member is substantially concentric with and carried by said output shaft of said motor.

8. The combination according to claim 1 wherein said second enclosure is comprised of a cup-shaped housing and a cover closing said cup-shaped housing.

9. The combination according to claim 8 wherein a wall of said cup-shaped housing includes a plurality of substantially narrow slots.

10. The combination according to claim 9 wherein said substantially narrow slots are grouped in a first and second set of slots in one of said walls, each set having a plurality of slots.

11. The combination according to claim 10 wherein said second switching means includes a plurality of contact carrying blades disposed in one of said first and second sets of slots in said cup-shaped housing.

12. The combination according to claim 11 wherein said cover entraps said plurality of contact-carrying blades in said first and second sets of slots of .said second housing.

13. The combination according to claim 11 wherein at least one of said contact-carrying blades includes a cam follower tip disposed on the distal end thereof, said follower tip engaging said second cam means.

14. The combination according to claim 13 wherein said second cam means comprises a primary cam member including two cam tracks each of which is engaged by one of said cam follower tips.

15. The combination according to claim 1 wherein said second switching means includes a plurality of contact-carrying blades and a contact spacing means maintaining two of said contact-carrying blades in spaced relation to each other.

16. The combination according to claim 15 wherein said contact spacing means includes at least one slider freely translatable along one of a plurality of slider guides.

17. The combination according to claim 16 wherein said plurality of contact-carrying blades restrain said slider in contact with one of said slider guides.

18. The combination according to claim 1 wherein said second cam means in said substantially-thin second timing means comprises a primary cam member and a secondary cam member, wherein said primary cam is carried on said output shaft, and said secondary cam is carried on a second shaft rotatably journaled in said second enclosure.

19. The combination according to claim 18 wherein 6 each of said primary and secondary cam members includes two substantially concentric cam tracks and a gear.

6. 20. The combination according to claim 19 wherein each of said primary and secondary cam members includes a cam track separation means.

21. The combination according to claim 20 wherein said cam track separation means comprises said gear.

22. The combination according to claim 19 wherein said secondary cam member is rotatably coupled to said primary cam member by a coupling means.

23. The combination according to claim 22 wherein said coupling means comprises said gears of said primary cam member and said secondary cam member in engagement.

24. The combination according to claim 10 wherein said substantially-thin second cam means comprises a primary cam member and a secondary cam member and wherein said electrical switching means includes a long set and a short set of contact-carrying blades, each set disposed in one of said first and said second sets of slots, said short set responsive to said secondary cam member and said long set responsive to said primary cam member.

25. The combination according to claim 24 wherein said cover entraps said plurality of contact-carrying blades in said first and second sets of slots of said cupshaped housing.

26. The combination according to claim 24 wherein one of said long and short sets of contact-carrying blades is located on one side of a line through the centers of said primary and secondary cam members, and

the remaining one of said long and short sets of contact-carrying blades is located on the other side of said line.

27. In combination, a motor, a first timing means, and a substantially-thin second timing means, one of said motor, first timing means and substantially thin second timing means sandwiched in between the other two, and an attachment means wherein:

a. said motor includes an output shaft extending into said substantially-thin second timing means and said first timing means;

b. said first timing means comprises a first cam means, a first electrical switching means responsive to said first cam means, a first enclosure substantially enveloping both of said first cam means and said first electrical switching means;

c. said substantially-thin second timing means comprises a second cam means, a second switching means responsive to said second cam means, and a second enclosure substantially enveloping both of said second cam means and said second electrical switching means, said second cam means comprising a primary cam member and a secondary cam member, wherein said primary cam is carried on said output shaft, and said secondary cam is carried on a second shaft rotatably journaled in said second enclosure; and

(1. said attachment means includes a motor attachment means coupling said motor to one of said first and second enclosures and a timer attachment means for coupling said first enclosure to said second enclosure.

28. In combination, a motor, a first timing means, and a substantially thin second timing means sandwiched in between said motor and said first timing means, and an attachment means wherein:

7 a. said motor includes an output shaft extending into said substantially-thin second timing means and said first timing means; b. said first timing means comprises a first cam means, a first electrical switching means responsive to said first cam means, a firstenclosure substantially enveloping both of said first cam means and said first electrical switching means;

c. said substantially-thin second timing means com prises a second cam means, a second switching means responsive to said second cam means, and

a second enclosure substantially enveloping both of i said second cam means and said second electrical switching means; and

d. said attachment means includes a motor attachment means coupling said motor to one of said first and second enclosures and a timer attachment I said motor, first timing means and substantially thin second timing means sandwiched in between the other two, and an attachment means wherein:

a. said motor includes an output shaft extending into said substantially-thin second timing means and 8 saidfirst timing means;

b. said first timing means comprises a first cam means, a first electrical switching means responsive to said first cam means, a first enclosure substantially enveloping both of said first cam means and said first electrical switching means;

c. said substantially-thin second timing means comprises a second cam means, a second switching means responsive to said second cam means, and a second enclosure substantially enveloping both of said second cam means and said second electrical switching means;

I d. said attachment means coupling said motor to one of said first and second enclosures and a timer attachment means for coupling said first enclosure to said second enclosure;

, e. said second enclosure comprises a cup-shaped housing and a cover'closing same, and substantially narrow slots disposed in a wall of said cup shaped housing grouped in firstand second sets, each set having aplurality of slots; and wherein f. said substantially-thin second cam means comprises a primary cam member and a secondary cam member and wherein said electrical switching means includes along set and a short set of contact-carrying blades, each set disposed in one of said first and said second sets of slots, said short set responsive to said secondary cam member and said long set responsive to said primary cam member.

UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent No. 38243.57 Dated July 16 willi'am R. Brown & Noel C. Mullikin It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

Col. 2, line 38, delete "are" and substitute therefore ---and- Signed and sealer? this 15th day of April 1375,

T 4. u: Mu t. Commissioner of ratents attestlng Ofzlcer and Trademarks USCOMM-DC 60376-PB9 u.s GOVERNMENI PRINTING OFFICE: 930

: ORM PO-105G (10-6-9) UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent No. 3824357 Dated July 16 l 9 Z4 William R. Brown & Noel C. Mullikin It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

Col; 2, line 38, delete "are and substitute therefore -and-- .t st mied and seals-c tin."

= 15th day Of April L975.

. o moor. Commissioner of Patents attesting dfiicer and Trademarks ORM PO-105O (10-69) USCOMM-DC 60376-P69 u 5 sovznunzm PRINTING OFFICE: 93 o 

1. In combinAtion, a motor, a first timing means, and a substantially-thin second timing means, one of said motor, first timing means and substantially thin second timing means sandwiched in between the other two, and an attachment means wherein: a. said motor includes an output shaft extending into said substantially-thin second timing means and said first timing means; b. said first timing means comprises a first cam means, a first electrical switching means responsive to said first cam means, a first enclosure substantially enveloping both of said first cam means and said first electrical switching means; c. said substantially-thin second timing means comprises a second cam means, a second switching means responsive to said second cam means, and a second enclosure substantially enveloping both of said second cam means and said second electrical switching means; d. said attachment means includes a motor attachment means coupling said motor to one of said first and second enclosures and a timer attachment means for coupling said first enclosure to said second enclosure; and e. said enclosure includes a ratio of thickness-to-perimeter distance of from 1/40 to 1/20, wherein said thickness is taken in a direction substantially parallel to a longitudinal axis of said output shaft, and said perimeter is measured around said second enclosure in a plane substantially perpendicular to said longitudinal axis of said output shaft.
 2. The combination according to claim 1 wherein said substantially-thin second timing means is sandwiched in between said motor and said first timing means.
 3. The combination according to claim 2 wherein said motor attachment means comprises a plurality of hollow rivets inserted through a plurality of holes in said second enclosure and through a matching plurality of holes in said motor, said rivets headed, thereby securing said second enclosure to said motor.
 4. The combination according to claim 3 wherein said timer attachment means comprises a plurality of screws each with a head and shank, the shanks of which are inserted through said hollow headed-over rivets and threaded into said first enclosure, thereby securing said first timing means to said motor and said substantially thin second timing means.
 5. The combination according to claim 1 wherein said second cam means in said substantially-thin second timing means comprises one primary cam member.
 6. The combination according to claim 5 wherein said primary cam member includes two substantially concentric primary cam tracks.
 7. The combination according to claim 6 wherein said primary cam member is substantially concentric with and carried by said output shaft of said motor.
 8. The combination according to claim 1 wherein said second enclosure is comprised of a cup-shaped housing and a cover closing said cup-shaped housing.
 9. The combination according to claim 8 wherein a wall of said cup-shaped housing includes a plurality of substantially narrow slots.
 10. The combination according to claim 9 wherein said substantially narrow slots are grouped in a first and second set of slots in one of said walls, each set having a plurality of slots.
 11. The combination according to claim 10 wherein said second switching means includes a plurality of contact-carrying blades disposed in one of said first and second sets of slots in said cup-shaped housing.
 12. The combination according to claim 11 wherein said cover entraps said plurality of contact-carrying blades in said first and second sets of slots of said second housing.
 13. The combination according to claim 11 wherein at least one of said contact-carrying blades includes a cam follower tip disposed on the distal end thereof, said follower tip engaging said second cam means.
 14. The combination according to claim 13 wherein said second cam means comprises a primary cam member including two cam tracks each of which is engaged by one of said cam follower tips.
 15. The combination according to claim 1 wherein said second switching means includes a plurality of contact-carrying blades and a contact spacing means maintaining two of said contact-carrying blades in spaced relation to each other.
 16. The combination according to claim 15 wherein said contact spacing means includes at least one slider freely translatable along one of a plurality of slider guides.
 17. The combination according to claim 16 wherein said plurality of contact-carrying blades restrain said slider in contact with one of said slider guides.
 18. The combination according to claim 1 wherein said second cam means in said substantially-thin second timing means comprises a primary cam member and a secondary cam member, wherein said primary cam is carried on said output shaft, and said secondary cam is carried on a second shaft rotatably journaled in said second enclosure.
 19. The combination according to claim 18 wherein each of said primary and secondary cam members includes two substantially concentric cam tracks and a gear.
 20. The combination according to claim 19 wherein each of said primary and secondary cam members includes a cam track separation means.
 21. The combination according to claim 20 wherein said cam track separation means comprises said gear.
 22. The combination according to claim 19 wherein said secondary cam member is rotatably coupled to said primary cam member by a coupling means.
 23. The combination according to claim 22 wherein said coupling means comprises said gears of said primary cam member and said secondary cam member in engagement.
 24. The combination according to claim 10 wherein said substantially-thin second cam means comprises a primary cam member and a secondary cam member and wherein said electrical switching means includes a long set and a short set of contact-carrying blades, each set disposed in one of said first and said second sets of slots, said short set responsive to said secondary cam member and said long set responsive to said primary cam member.
 25. The combination according to claim 24 wherein said cover entraps said plurality of contact-carrying blades in said first and second sets of slots of said cup-shaped housing.
 26. The combination according to claim 24 wherein one of said long and short sets of contact-carrying blades is located on one side of a line through the centers of said primary and secondary cam members, and the remaining one of said long and short sets of contact-carrying blades is located on the other side of said line.
 27. In combination, a motor, a first timing means, and a substantially-thin second timing means, one of said motor, first timing means and substantially thin second timing means sandwiched in between the other two, and an attachment means wherein: a. said motor includes an output shaft extending into said substantially-thin second timing means and said first timing means; b. said first timing means comprises a first cam means, a first electrical switching means responsive to said first cam means, a first enclosure substantially enveloping both of said first cam means and said first electrical switching means; c. said substantially-thin second timing means comprises a second cam means, a second switching means responsive to said second cam means, and a second enclosure substantially enveloping both of said second cam means and said second electrical switching means, said second cam means comprising a primary cam member and a secondary cam member, wherein said primary cam is carried on said output shaft, and said secondary cam is carried on a second shaft rotatably journaled in said second enclosure; and d. said attachment means includes a motor attachment means coupling said motor to one of said first and second enclosures and a timer attachment means for coupling said first enclosure to said second enclosure.
 28. In combination, a motor, a first timing means, and a substantially thin second timing means sandwiched in between said motor and said first timing means, and an attachment means wherein: a. said motor includes an output shaft extending into said substantially-thin second timing means and said first timing means; b. said first timing means comprises a first cam means, a first electrical switching means responsive to said first cam means, a first enclosure substantially enveloping both of said first cam means and said first electrical switching means; c. said substantially-thin second timing means comprises a second cam means, a second switching means responsive to said second cam means, and a second enclosure substantially enveloping both of said second cam means and said second electrical switching means; and d. said attachment means includes a motor attachment means coupling said motor to one of said first and second enclosures and a timer attachment means for coupling said first enclosure to said second enclosure, said motor attachment means comprising a plurality of hollow rivets inserted through a plurality of holes in said second enclosure and through a matching plurality of holes in said motor, said rivets headed, thereby securing said second enclosure to said motor.
 29. In combination, a motor, a first timing means, and a substantially-thin second timing means, one of said motor, first timing means and substantially thin second timing means sandwiched in between the other two, and an attachment means wherein: a. said motor includes an output shaft extending into said substantially-thin second timing means and said first timing means; b. said first timing means comprises a first cam means, a first electrical switching means responsive to said first cam means, a first enclosure substantially enveloping both of said first cam means and said first electrical switching means; c. said substantially-thin second timing means comprises a second cam means, a second switching means responsive to said second cam means, and a second enclosure substantially enveloping both of said second cam means and said second electrical switching means; d. said attachment means coupling said motor to one of said first and second enclosures and a timer attachment means for coupling said first enclosure to said second enclosure; e. said second enclosure comprises a cup-shaped housing and a cover closing same, and substantially narrow slots disposed in a wall of said cup shaped housing grouped in first and second sets, each set having a plurality of slots; and wherein f. said substantially-thin second cam means comprises a primary cam member and a secondary cam member and wherein said electrical switching means includes a long set and a short set of contact-carrying blades, each set disposed in one of said first and said second sets of slots, said short set responsive to said secondary cam member and said long set responsive to said primary cam member. 